" Unlike the quarks, they do not possess a quality called "color", and their interactions are only weak and electromagnetic, and fall off with distance. On the other hand, the strong or "color" force between quarks gets stronger with distance, so that quarks are always found in colorless combinations called hadrons, a phenomenon known as quark confinement . These are either fermionic baryons composed of three quarks (the proton and neutron being the most familiar example) or bosonic mesons composed of a quark-antiquark pair (such as pions). The mass of such aggregates exceeds that of the components due to their binding energy. Tests and predictions The Standard Model predicted the existence of W and Z bosons, the gluon, the top quark and the charm quark before these particles had been observed. Their predicted properties were experimentally confirmed with good precision. The Large Electron-Positron collider at CERN tested various predictions about the decay of Z bosons, and found them confirmed. Hot Model Thai To get an idea of the success of the Standard Model a comparison between the measured and the predicted values of some quantities are shown in the following table: Quality Measured (GeV) SM prediction (GeV) Mass of W boson 80,4120±0,0420 80,3900±0,0180 Mass of Z boson 91,1874±0,0021 91,1874±0,0021 Challenges to the Standard Model Although the Standard Model has had great success in explaining experimental results, it has never been accepted as a complete theory of fundamental physics. This is because it has two important defects: The model contains 19 free parameters, such as particle masses, which must be determined experimentally (plus another 10 for neutrino masses). "

" Some people who are better known for other accomplishments have also worked as professional models: 1908 Ford Model T advertisement Ford Model T used for giving tourist rides at Greenfield Village 1925 Ford “New Model� T Tudor Sedan The suspension components of a Ford Model T For the blues musician, see T-Model Ford. The Model T (colloquially known as the Tin Lizzie and the Flivver) was an automobile produced by Henry Ford's Ford Motor Company from 1908 through 1928. The first production Model T was built on September 27, 1908 at the Piquette Plant in Detroit, Michigan. Cars built before 1919 are classed as veteran cars and later models vintage cars. There were several cars produced or prototyped by Henry Ford from the founding of the company in 1903 until the Model T came along. Although he started at the Model A, there were not 19 production models; some were only prototypes. The production model immediately before the Model T was the Ford Model S [1], an upgraded version of the company's largest success to that point, the Model N. Hot Model Vietnamese For some reason, the follow-on was the Model A and not the Model U. Characteristics The Ford Model T car was designed by Henry Ford, Childe Harolde Wills and two Hungarian emigrants named József Galamb and Jenő Farkas. "